On the Superstability of the Pexider Type Trigonometric Functional Equation
© Gwang Hui Kim 2010
Received: 23 October 2009
Accepted: 3 January 2010
Published: 21 January 2010
We will investigate the superstability of the (hyperbolic) trigonometric functional equation from the following functional equations: and , which can be considered the mixed functional equations of the sine function and cosine function, the hyperbolic sine function and hyperbolic cosine function, and the exponential functions, respectively.
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